Init.

compress.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env -S python3
+
+import subprocess
+import sys
+
+
+def main():
+    [_, input] = sys.argv
+    input_tar = input + ".tar"
+    output = input + ".cprmt"
+    print("Compressing '" + input + "' into '" + output + "'.")
+    subprocess.Popen(["tar", "cf", input_tar, input]).wait()
+    input_tar_fd = open(input_tar, "rb")
+    output_fd = open(output, "wb")
+    byte_index = 0
+    while True:
+        read = input_tar_fd.read(1024)
+        if len(read) == 0:
+            break
+        for byte in read:
+            if byte_index == 0:
+                output_fd.write(bytes([5, byte]))
+            else:
+                output_fd.write(bytes([byte]))
+            byte_index += 1
+            byte_index %= 4
+    print("Done.")
+
+
+if __name__ == "__main__": main()